APPARATUS AND METHOD FOR CONTROLLING ACTIVATION OF AN ELECTRONIC DEVICE

• US 20090326730A1
• Filed: 03/14/2007
• Published: 12/31/2009
• Est. Priority Date: 03/14/2006
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: TIR Technology LP
• Inventors: Ashdown, Ian, Bjeljac, Bojana, Toma, Ion
• Application Number:
  US12/282,645
• Publication Number:
  US 20090326730A1
• Time in Patent Office: Days
• US Class Current: 700/296
• CPC Class Codes: H03K 7/08 Duration or width modulation ; Duty cycle modulation

Abstract

The present invention provides a method and apparatus for controlling the activation of an electronic device. For a desired activation ratio, which defines the “ON” time relative to the “OFF” time of the electronic device for a given time period, the method and apparatus according to the present invention evaluates an activation sequence. The activation sequence comprises two or more activation time periods and one or more deactivation periods, wherein the ratio between the two or more activation periods and the predetermined time period is equivalent to the desired activation ratio.

Claims

1. A method for controlling activation of an electronic device, the method comprising the steps of:

a) obtaining a desired activation ratio for a predetermined time period, the activation ratio representative of an ON time period of the electronic device relative to the predetermined time period;

b) determining an activation sequence for the electronic device, the activation sequence including two or more activation time periods and one or more deactivation time periods, wherein the two or more activation time periods relative to the predetermined time period is equivalent to the activation ratio.

2. The method according to claim 1, wherein during the step of determining the activation sequence, the two or more activation time periods are reproducibly determined.

3. The method according to claim 1, wherein during the step of determining the activation sequence, the two or more activation time periods are randomly determined.

4. The method according to claim 1, wherein one of the two or more activation time periods is defined at a smallest activation time period, wherein the smallest activation time period is indicative of a resolution level and the predetermined time period.

5. The method according to claim 1, wherein one of the two or more activation time periods is defined at a smallest activation time period, wherein determining the activation sequence is performed by a controller having a central clock, wherein the smallest activation time period is indicative of the central clock.

6. The method according to claim 1, wherein the activation sequence is stored in a memory upon determination.

7. The method according to claim 1, wherein the activation sequence is randomly rotated.

8. The method according to claim 1, wherein evaluation of the activation sequence is refreshed at a rate greater than 100 Hz.

9. The method according to claim 8, wherein the evaluation of the activation sequence is refreshed at a rate of about 200 Hz.

10. An apparatus for controlling activation of an electronic device, the apparatus comprising:

a) means for obtaining a desired activation ratio for a predetermined time period, the activation ratio representative of an ON time period of the electronic device relative to the predetermined time period;

b) means for determining an activation sequence for the electronic device, the activation sequence including two or more activation time periods and one or more deactivation time periods, wherein the two or more activation time periods relative to the predetermined time period is equivalent to the activation ratio.

11. The apparatus according to claim 10, comprising a controller configured with a dual central processing unit architecture.

12. The apparatus according to claim 11, wherein a first central processing unit is configured as a communication processor and a second central processing unit is configured to generate the activation sequence.

13. The apparatus according to claim 10, wherein a plurality of activation sequences are evaluated and stored in a memory means operatively coupled to the apparatus.

14. An apparatus for controlling activation of an electronic device, the apparatus comprising:

a) a memory holding a plurality of activation sequences, each of the activation sequences directly representative of a particular activation ratio and a predetermined time period, each activation sequence including two or more activation time periods and one or more deactivation time periods, wherein the two or more activation time periods relative to a predetermined time period is equivalent to the particular activation ratio;

b) a controller configured to receive a desired activation ratio for the predetermined time period, the controller further configured to access the memory and determine the activation sequence that corresponds to the desired activation ratio and the controller configured to generate control signals based on the determined activation ratio and transmit the control signals to the electronic device

15. The apparatus according to claim 14, wherein the memory comprises one activation sequence for each activation ratio.

16. The apparatus according to claim 14, wherein the memory comprises one activation sequence for two related activation ratios.

17. The apparatus according to claim 16, wherein one activation sequence is directly representative of a first of the two related activation ratios and an inverse of the one activation sequence directly representative of a second of the two related activation ratios.

18. A computer program product comprising a computer readable medium having recorded thereon statements and instructions for execution by a processor to carry out a method for controlling activation of an electronic device comprising the steps of:

a) obtaining a desired activation ratio for a predetermined time period, the activation ratio representative of an ON time period of the electronic device relative to the predetermined time period;

b) determining an activation sequence for the electronic device, the activation sequence including two or more activation time periods and one or more deactivation time periods, wherein the two or more activation time periods relative to the predetermined time period is equivalent to the activation ratio.